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There are other types of reagents used to determine what type of biomolecule a sub-
stance is. For example, copper ions present in Benedict's reagent reacts with the free
end of any reducing sugars, such as glucose, when heated. Originally blue in color,
these copper ions are reduced by the sugar, and produce an orange-red colored precipi-
tate. Alternatively, iodine-potassium iodide (IKI) may also be used when working with
starch. IKI contains special tri-iodine ions which interact with the coiled structure of a
starch polymer. Prior to a reaction, the IKI displays a yellow-brown color; however, after reacting with starch, a dark purple or black color is presented.

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